The UK government’s plan for what will happen in the coming days after the death of Queen Elizabeth II is codenamed “Operation London Bridge”.
It's widely expected to include the period of official mourning and details of her state funeral.
The plans were first created in the 1960s and have been updated throughout each year.
Some critical decisions relating to the plan have been made by the Queen herself, although some can only be made by her successor, Charles, the new King.
The phrase "London Bridge is down" was presumed used to communicate the death of the Queen to the UK Prime Minister and key personnel, setting the next phase of the plan into motion.
The royal family are expected to announce details of the queen’s funeral, which traditionally should be held 10 days following her death.
Parliamentary business is likely to be suspended for 10 days and the sovereign’s coffin is suggested will lie in state for three days at the Houses of Parliament.
An Air India plane bound for London with 242 people on board crashed minutes after taking off from India's western city of Ahmedabad on Thursday, the airline and police said, and India's federal health minister said that "many people" were killed.
The United Nations General Assembly will vote on Thursday on a draft resolution that demands an immediate, unconditional and permanent ceasefire in the war in Gaza after the US vetoed a similar effort in the Security Council last week.
Israel's parliament rejected early on Thursday a preliminary vote to dissolve itself, the Knesset said in a statement, after an agreement was reached regarding a dispute over conscription.
US troops in Los Angeles are authorised to detain people until police can arrest them, their commanding officer said on Wednesday, as hundreds of Marines prepared to move into a city rocked by protests over President Donald Trump's immigration raids.
The Arab League has welcomed the sanctions imposed on two Israeli far-right ministers, saying the move is a step towards accountability for "instigated violence" and "contributing to settler attacks on Palestinians".